These funnels will snap quickly in place, allowing the pad to align correctly with the sample tunnel. They are made with a compression ring around the sample hole in order to better control the rate of absorption, and to ensure more consistent results. Two ports, one in the sample well and one in the tunnel, provide great versatility. Samples are loaded directly through the chamber caps to prevent spilling of hazardous ones. Caps provide added safety to the operator. A large, centred cell deposit area makes screening easier and more sensitive. Double funnels with two chambers enable cell deposit areas to be close together and easy to find, helping to speed sample analysis. Two deposit areas on one slide enhance all of the advantages of single chambers whilst reducing time spent loading and unloading slides.